I have an LB9 305 thats going to get minor head work, LT1 cam, porting TPI and exhaust. Would I have to tweak the computer at all with this? I heard that adding an LT1 cam would need ecm adjusting.

 

Is that cam even really much different than your stock cam??

 

Very much so. the cam I have now is called the "peanut" cam and is almost useless...

 

I consider all the stockers peanuts... - anyhow, Your talking a 87 MAF car right? if so, then no. It won't be a perfect tune, but it'll run fine. Dans87GTA is running a much bigger cam than that on a stock 87 L98 tune. Just do the procedure to set minimum idle and set TPS voltage. - Then to pic up some ponies, have it tuned sometime when funds allow. hell, you can pic up ponies w/ a good tune on a stock cam...

 

Sounds good to me. Thanks for the input.

 

Isn't it the same as the L98 cam?

 

I am quite sure it is not.

 

Well that surprises me, because the LB9's power output scales pretty linearly with the L98, which would suggest to me that the cam is at least pretty similar. OR that's just how horribly choked stock TPI is (and an L98 would make that much more with a better intake manifold).

 

Yeah the TPI was designed for the 305 so I don't doubt the choking numbers on a 350. I've asked around and talked to alot of ppl and they all say that the LT1 cam is the best bang for my buck and I'm not looking for a powerful 305 as I'm building a 355. This is just to have some fun with until the powerhouse is done...

 

LB9 and L98 cams are fairly similar. I don't understand why people talk like one is decent and one isn't. I've had both in hand, looked at specs to both, even turned in a lathe w/ a dial-bore gauge...they're not that different. - the LT1 cam is a bit better.

 

That's what I thought.

Any factory LT1 cam is pretty mild. They get the HP from good heads, good intake, and good EFI + PCM...

 

- The LT1 cam is still bigger than the L98 cam. The L98 is bigger than the LB9,(not by much as I stated), but bigger. - As long as you get it for a good price, not a bad deal, expecially for what he wants it for.

 

Just what are your specs of the L98 cam?

There are different versions of the LT1 cam, ranging from

191/196° I/E @ 0.050 on a 111° LCA with 0.418"/0.430" I/E lift in the Bcar (94-96)

to

205/207° I/E @ 0.050 on a 117° LCA with 0.451"/0.450" I/E lift in the Ycar (92)

and

200/207° I.E @ 0.050 on a 117° LCA with 0.447"/0.459" I/E lift in the Fcar (96)

My specs on the L98 are in the range of:

202/207° I/E @ 0.050 on a 114° LCA with 0.413"/0.428" I/E lift

So unless my specs are wrong, other than lift (just add 1.6 rockers to the L98 and you're there), the LT1 cam is either the same or slightly milder (factoring in LCA). This actually makes sense because each new SBC head revision makes them better and better; they need less cam (duration) to make the rated HP (which always goes up).

I'm not trying to pick a fight, but I want to get the facts straight, either you or me.

 

Well I can probably get an L98 cam for free. Would this be worth it? What could I rev too with the L98 cam vs the LT1? I was planning on using 1.6 rockers anyway, so what cam would I benefit more from? Mind you, I would doubt this motor would hit 13's so mid to low 14's would be nice. Any other thoughts on what I could do to get to that? Or maybe some parts to change out to get me into the 13's. I have a link on a '84 rear with 3.45 posi disc that I'll probably end up swapping in, so that will definatly help out. I'll go over what I'm doing again so that it refreshs you're memories...

LB9 305 - Ported stock heads (3angle/valve cutting)
TPI - Ported base/plenum (was told porting runners is useless)
Full exhaust - headers to throw on along with 3" ypipe
3.45 posi
some brand of torque converter as well as a shift kit, what stall?
Bigger valve springs/1.6 rockers
22# injectors
52mm TB (bbk) - maybe overkill but ill throw it on anyway
AFPR - bbk

 

HEy if you want a bigger cam Ever think about a lt4 cam they are from the 96 year the firehawk had them and the upper end vett. Thats what i plan on getting when $ allows

 

Every thought about the ZZ4 cam.
I forget all the specs, but it's a 208@050 intake.

 

I'm going with a 355 now. It's a 72 Camaro Z/28 block. Should be fun with all my go fast goodies on it. I'm still debating the cam, but I was checking out the .525/.525 cams. After I do some mild porting to the heads, I'll know for sure.

 

what heads? -
on the 525/525 cam - if you're running GM heads, even ported, they tend to run better w/ a split pattern cam. Stock exhaust ports just aren't up to snuff, so the extra exhaust lift helps....

 

I meant to say .525, or around there. I read up on it and yah, I realize about the dual pattern. What do you suggest? The heads are stock with the block but I will probably get them ported (3angle/valvce cut), what could I run? Would you suggest me porting the heads more, like bowl work?